5.3 capacitors in the real world Flashcards
1
Q
Why can’t ordinary capacitors be used to store large quantities of electrical energy
A
It would take a whole room of them to supply a hundred watts for an hour
2
Q
What can a bank of supercapacitors be used for
A
They could be used to back up electrical systems in hospitals in the event of a power cut for example
3
Q
Where are some places capacitors can be found in the home
A
in a computer keyboard and inside the cable from a satellite dish
4
Q
What is the relationship between the p.d across a capacitor and the charge on the plates
A
The p.d across a capacitor is proportional to the charge on its plates
5
Q
How would you convert a digital voltmeter into a coulombmeter
A
By connecting a capacitor across the terminals
